Earls said the driver immediately got out of the truck to see if anyone was injured.

"He wanted to know if everything was okay," Earls said, "He was so concerned. He said, 'Oh my God, I can't believe what happened.'"

KVAL reported the driver told authorities the rear wheels on his 1970 Ford spun out in the mud, and he crashed into a barricade. The truck cleared the barricade and its 48-inch tires landed on three spectators, KVAL reported.

The sheriff's sergeant told KVAL the victims' injuries were not life-threatening.